/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the License at the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apereo.portal.groups.pags.dao;

import net.sf.ehcache.Element;
import net.sf.ehcache.search.attribute.AttributeExtractor;
import net.sf.ehcache.search.attribute.AttributeExtractorException;
import org.apereo.portal.EntityIdentifier;

/**
 * Used within Ehcache to find keys that reference the specified username.
 *
 * @since 5.0
 */
public class EhcacheMemberIdAttributeExtractor implements AttributeExtractor {

    @Override
    public Object attributeFor(Element element, String attributeName)
            throws AttributeExtractorException {
        final MembershipCacheKey membershipCacheKey = (MembershipCacheKey) element.getObjectKey();
        final EntityIdentifier ei = membershipCacheKey.getMemberId();
        return ei.getKey();
    }
}
